Thermador PRD366WGU Pro Grand Range Fd Error Fix: Simultaneous Bake & Broil Relay Activation

The bake and broil relay drives are activating at the same time — a dangerous condition. Check the relay board for damage. Replace relay board if defective; replace ERC if it is the source.

critical2 fixes available

Quick Answer

Error Fd on the Thermador PRD366WGU Pro Grand Range means: Simultaneous Bake & Broil Relay Activation. The top-ranked community fix is “Check & Replace Relay Board” (hard difficulty, ~50 min, DIY cost: $60–$150). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · oven

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many oven repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $200–$350.

Other Thermador PRD366WGU Pro Grand Range Error Codes

Electronic Oven Control Failure

1 fix

Electronic Oven Control Failure

1 fix

F10

Control Board Communication Error

2 fixes

F11

Oven Temperature Sensor Short Circuit

2 fixes

F12

Oven Control Board Overvoltage Protection Triggered

2 fixes

F13

Oven High Limit Thermostat Open

2 fixes

Oven Over-Temperature

2 fixes

Open Oven Temperature Sensor (RTD)

1 fix

People Also Ask About Thermador PRD366WGU Pro Grand Range Error Fd

What does error code Fd mean on a Thermador PRD366WGU Pro Grand Range?

Error code Fd on the Thermador PRD366WGU Pro Grand Range means: Simultaneous Bake & Broil Relay Activation. The bake and broil relay drives are activating at the same time — a dangerous condition. Check the relay board for damage. Replace relay board if defective; replace ERC if it is the source.

How do I fix error code Fd on my Thermador PRD366WGU Pro Grand Range?

The most successful fix is "Check & Replace Relay Board" (hard difficulty, ~50 minutes). Estimated DIY cost: $60–$150. HomeMD has 2 community-ranked fixes for this error.

Is error code Fd on a Thermador PRD366WGU Pro Grand Range serious?

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Thermador PRD366WGU Pro Grand Range error Fd myself?

Yes — the top-ranked community fix ("Check & Replace Relay Board") is rated hard difficulty and takes about 50 minutes. Tools needed: Phillips screwdriver, Nut driver set, Multimeter, Needle-nose pliers.

How much does it cost to repair Thermador PRD366WGU Pro Grand Range error Fd?

DIY cost: $60–$150. Professional repair typically costs $200–$350. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Thermador PRD366WGU Pro Grand Range have?

The Thermador PRD366WGU Pro Grand Range has 8 other known error codes, including: F0 (Electronic Oven Control Failure), F1 (Electronic Oven Control Failure), F10 (Control Board Communication Error), F11 (Oven Temperature Sensor Short Circuit), F12 (Oven Control Board Overvoltage Protection Triggered), and 3 more.

What other error codes does the Thermador PRD366WGU Pro Grand Range have?

The Thermador PRD366WGU Pro Grand Range has 8 other known error codes:

F0 — Electronic Oven Control Failure (1 fix)
F1 — Electronic Oven Control Failure (1 fix)
F10 — Control Board Communication Error (2 fixes)
F11 — Oven Temperature Sensor Short Circuit (2 fixes)
F12 — Oven Control Board Overvoltage Protection Triggered (2 fixes)
F13 — Oven High Limit Thermostat Open (2 fixes)
F2 — Oven Over-Temperature (2 fixes)
F3 — Open Oven Temperature Sensor (RTD) (1 fix)

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